Recurrent COPA mutation drives R-spondin-independent Wnt activation in intestinal tumors. - Fujii M; Abeto N; Kishimoto S; Shiraishi K; Hashimoto T; Hiraoka N; Nonaka S; Kojima M; Matano M; Takahashi S; Colozza G; Koo BK; et al. (Nature genetics, 2026)